The discovery took a place when scuba-diver Alan Sutton spotted an unusually-shaped formation in the water while flying in a helicopter off the coast of Tanzania. After a few years of searching for the ruins, he announced his success in a blog post . It took him three years to discover the ruins of structures resembling an ancient harbor city. Researchers claim that the ruins cover a large area and there are impressive lines of foundations covered by the thousands of square and oblong blocks.